European Physical Journal C: Particles and Fields European Physical Journal C: Particles and Fields, 2017, 77, pp.550. ⟨10.1140/epjc/s10052-017-5090-4⟩ The European physical journal / C C77(8), 550 (2017). doi:10.1140/epjc/s10052-017-5090-4 European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2017, 77, pp.550. ⟨10.1140/epjc/s10052-017-5090-4⟩